nova-manage: remove redundant 'dest' args

Includes a hack to calculate 'dest' from the argument name. This hack is
removed in a later commit.

Change-Id: I60567ff232ab7699f3234b3bfc1618a17a648976
Merge "nova-manage: remove redundant 'dest' args"
Merge remote-tracking branch 'm_src_repo/master' into build-temp